18．We are putting too much carbon dioxide into the atmosphere，which prevents heat from escaping from the earth．

分析 我們把太多的二氧化碳排放到了大氣中，這便阻止了熱量從地球上逸出．

解答 答案：prevents
根據(jù)句意以及首字母的提示可知，此處在句中作謂語，并與其后的from構(gòu)成：阻止…做某事；由于本句是非限定性定語從句，關(guān)系代詞which指代前面的句子在該從句中作主語，根據(jù)主句使用了一般現(xiàn)在時(shí)可知，此處的謂語動(dòng)詞應(yīng)使用第三人稱單數(shù)形式，故用prevents．

點(diǎn)評 做類似的題時(shí)，首先應(yīng)根據(jù)句意以及首字母的提示判斷出空缺處的意思；其次從語法分析的角度，確定出應(yīng)填單詞的形式；因此在平時(shí)的學(xué)習(xí)中，除了應(yīng)牢固記憶單詞的拼寫之外，還要熟練掌握一些的語法知識(shí)．

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